The One He Lost.

There was only ever one girl that had gotten close to his heart. His best friend. His secret crush. She was gone when they became fifteen.
He was the only one she had let in, told him everything. Everything except why she had to leave. Her best friend. Her secret crush.
What happens when they get reunited? Will they even recognise each other?
The detective and the new DI.
All rights go to Sir Arthur Conan Doyle and BBC apart from any of my original characters and cases.